Rotary pump



Oct. 18, 1949.. M. GRUBER 2,484,993 v ROTARY PUMP Filed June 4, 1946Patented Oct. 18, 1949 I UNITED STATES PATENT OFFICE BOTABY PUMP MilanGruber, Aliquinnfl, Pa.

Application June 4, 1948, Serial No. 674.295

1 Olaim. (Cl. 103-136) This invention relates to rotary pumps in whichan eccentrically mounted rotary drum carrying a. plurality ofoylindrical roller pistons operates within a stationary pump housing.

One of the main objects of the present invention is to provide a rotarypump inwhich the cylindrical roller pistons are not depending oncentrifugal force in order to create suction within the pump housing,such as is the case with nearly all pumps-of that type.

Another object of the invention is to provide a rotary pump in which thecyllndrica1 roller pistons always uniformly contactl the innerperipheral bore of the pump housing, while the eccentrically mounteddrum in which said roller pistons operate rotates.

Still another object of the invention is to proi vide a rotary pump withan eccentrically mounted drum in which a plurality of cylindrical rollerpistons freely rotate and which are in uniform vcontinuous contact withthe inner peripheral surface of the pump housing by means of a freelyinserted cylindrical Spring-member.

Yet another object of the invention is to provide a rotary pump whichmay be reversed without resorting to any alterations.

Another object of the invention is to provide a rotary pump which may beoperated at slow speed and which will pump liquid almost immediatelyafter the piston retaining drum is being rotated.

I Further objects of the invention are to provide a rotary pump of theclass set forth that shall be of exeeedingly simple construction andarrangements, efiicient in its Operation and which can be inexpensivelymanufactured. i

To the accomplishment of these and such other objects as may hereafterappear, the invention consists of the novel construction, combinationand arrangement of parts herein specifically described and illustratedin the accompanying clrawing, wherein is shown an embodiment of thepresent invention, but it is to be understood that changes, variationsand modifications may be resorted to which come Within the scope of theclaims hereunto appended.

In the drawing wherein like numerals of reference designatecorresponding parts throughout the several views:

Figure 1 represents a front view of a rotary pump constructed inaccordance with the invention in which one half is shown in outline andthe other half is shown in cross-section on line I-I in Figure 2.

Figure 2 is a side view of Figure 1 taken online 2-2 in Figure 1.

Figure 3 is an isometric view of the rotary drum constructed inaccordance with the invention.

Figure 4 is an isometric view of the cylindrical double Spring member asused in the invention.

Figure 5 is an isometric view of one of the cylindrical roller pistons.

Figure 6 represents an outline front view of the device, the frontbracket being removed and the supporting legs broken away.

Figure 7 is a fragmentary side view of the rotary drum showing thecylindrical roller pistons in position and mounted within the drum andextending outwardly of the drum and contacting the inner peripheral boreof the piston housing.

Referring now more particularly to Figure 2 of the drawing, the rotarypump comprises in general a piston housing ili, a rotary piston drum II,the front bracket IZ. the rear bracket I3, the cylindrical rollerpistons H and the cylindrical spring sleeve 33.

The said piston housing IU may take any form consistent with the use towhich the mechanism is to be put and includes a cylindrical bore l6, aninlet port IT and an outlet port I 8. The inner ends of these ports arepreferably enlarged as shown in dotted lines in Figure 1 and indicatedby the numerals l9 and 20. These enlargements extend an appreciabledistance of the bore Hi, with the exception that 20 extends upwardly and19 extends downwardly. This feature permits the pump to be reversed atwill without any alterations.

The rotary piston drum II, as best shown detailed in Figure 3, comprisesa circular dise 2! provided with integral, upstanding guide blocks 22,radially arranged to provide a guideway 23 for the roller piston Ill.

A drive shaft 24, preferably integral with the outside face 25 of saiddsc 2l, extends centrally and outwardly and is provided with a ballbearing 26 in abutment with said outside face 25.

Another circular disc 21 is secured to the free ends 28 of said guideblocks 22 by means of screws 29. or the said disc 21 may be madeintegral with the drive-shaft 24, disc 2I and guide blocks 22 if foundconvenient to do so.

The outer face 30 of said disc 21 is provided with a centrally disposedand outwardly extending, integral stub-shaft 3I which is adapted toreceive a ball bearing 32. i

The rotary piston drum I I, as shown in Figures 1, 3, 6 and 7 isdesigned to receive four of said rollers I 4, of course, more or lessroller pistons may be used if so deslred.

The cylindrical roller pistons I 4, as shown detailed in Figure 5, areof such diameter that all four rollers will contact the interiorcylindrical bore I6 of the piston housing at the same time. This isaccomplished, in order to provide a constant positive tendency to thrustthe roller pistons I4 outwardly and in contact with the bore I6 of thehousing III, by means of a cylindrical spring member 33, such as showndetailed in Figure 4.

This spring member 33 is positioned centrally within said drum I I andin positive contact with the four rollers I 4 freely conflned in theguideways 23 between the upstandlng guide blocks 22 of the drum II asshown in Figures l, 6 and 7.

The aforesaid cylindrical spring member 33 comprises an innercylindricai spring 34 which is snugly surrounded by an outer cylindricalSpring 35.

This inner cylindrical spring 34 may be made from any appropriatespringsheet material and formed to provide a longitudinal gap 36, whilethe outer cylindrical Spring 35 snugly surrounds the inner Spring 34 andis provided with a biased gap 31 (Figure 4) of substantially heiicalconfiguration.

Assembled, the discs 2I and 21 of said rotary piston drum II as well asthe guide blocks 22 are finished to form a srnooth cylindrical surface38.

The front bracket I2 comprlses an annular cover for the piston housingIII having a reduced, annular outer portion 39. The inner face 40 ofsaid front bracket I2 is provided with an eccentric counterbore 4I deepenough to accommodate the disc portion 2I of the drum I I, so that whenthe latter is in assembied position, the inner'face 40 of the frontbracket 62 comes in perfect alignment with the inner face 42 of the drumI I.

The aforesaid reduced outer annular portion 39 is provided with a commonstufling box 43 which is relied upon to seal the pump of any liquidescaping from the interior of the pump.

The rear bracket or cover `I3 comprises a circular cover for the pistonhousing Ill having a reduced portion 44. The inner face 45 of said rearbracket I3 is providedl with an eccentric counterbore 46 to accommodatethe disc 2'I of the drum II, when assembled. v

Of course it is well to note that the eccentric counterbore 4I of thefront bracket or cover I2 and the eccentric counterbore 46 of the rearbracket I 3 are in allgnment, when assembied, and in eccentric relationwith the bore I6 of the piston housing IO.

The front and rear brackets I2 and I3 respectively are also providedwith a counterbore 4'Iv and 48 in which the ball bearlngs 26 and 32respectively are mounted.

In order to secure the pump to a suitable base, legs 49 are provided.These legs may be integral with the brackets I2 and I3, as shown, orthey may be integral with the piston housing III, or otherwise.

Obviously lubricant may be introduced to the ball bearings 26 and 32through openings 50 and 5I respectively and to the outer faces 25 and 30of the discs 2I and 21 respectively of the rotary drum I I and thereforeto the eccentric counterbores 4I and 46 in which the discs as part ofthe drum II rotates.

Located in each roller guide-way 23 of the drum II is a cylindricalroller piston I4 which fitS snugly therein, and also between the innerfaces 40 and 45 of front bracket I2 and rear bracket I3, respectively.

The Operation of my rotary pump is as follows:

Assuming that the inlet port I1 is connected by suitable piping to aliquid supply and the outlet or discharge port I8 connected to adistributing system which may be a pipe leading to a reservoir or othersuitable means.

When the pump is operated in either direction by manually rotating thepiston drum-shaft 24 or by motive power if so desired, the drum I I, ofcourse, also rotates and with it the roller pistons I 4, and since thepiston drum II and the piston housing III are mounted in eccentricrelation, a crescent shaped space 52 is thus created therebetween.

While the piston drum II rotates, the roller pistons I4 roll in andoutwardly of the guide-way 23 between the guide-blocks 22 .of the drumII and on account of the cooperative arrangement of the roller pistonsI4 and the cylindrical spring member 33, the roller pistons I4 arealways in positive contact with the peripheral surface of the bore I6.of the piston housing Ill.

At this time, I desire to call special attention to the fact that theherewith described roller pump is not of the type in which the rollerpistons depend on centrifugal force to contact the inner surface of thecylindrical bore in the housing so they may form a sealed space duringits contact.

As previously described the roller pistons in my invention arecontinuously in contact with the bore I6 of the piston housing II)thereby forming a sealed space between the roller pistons I4 and thebore I6 of housing II'I, and owing to the ecfl centric mounting of thepiston drum II in which the roller pistons operate in the piston housingIfl, the sealed space between the roller pistons and the bore I6 isincreased in volume as the drum I I is rotated thus producing a suctionwhich lifts the liquid and causes it to ow into the port I'I or IB,depending in which direction the pump is being rotated, where it entersand fllls the space between the roller pistons I4 and the housing boreI6.

As the piston drum II rotates, the other roller piston comes intooperative position relative to the intake port and as it passes thepoint 53 of the crescent shaped space 52 between the periphery of thebore I6 in housing III and the drum II attenuation will be provided tosuck or draw fiuid in.

As the crescent space decreases towards the outlet, the effect of theroller pistons will be to build up pressure in the fluid and force thesame through the outlet port under increased pressure.

The maximum pressure under which the pump operates can be varied byvarying the speed of rotation of the piston drum.

In the above specification the pump has been described with relation tothe rotary drum having four roller pistons Operating therein, but it isevident that any number of rollers can be used.

While a preferred specific embodiment of the invention is hereinbeforeset forth it is to be clearly understood that I am not limited to theexact construction illustrated and described, be-

cause various modifications of the details may be provided in puttingthe invention into practice within the purview of the appended claim.

I claim:

A rotary pump comprising a housing provided 5 with a cylindrical bore;intak'e and discharge ports leading to said bore, covers for saidhousing, a piston drum supported for rotation in said covers ineccentric relation to the .bore of said housing, said drum beingprovided with a pluralityl of radial guide Ways, each of said guide.Ways adapted to accommodate rotatably and slidablya horizontallydisposed cylindrical roller v piston, and centrally disposed means forurging said roller pistons uniformly against the wallof 15 Number thebore of said housing,- said means comprising two hollow coaxialresilient cylindrical members of which the inner one is telescoped intothe outer member, each having one gap extending throughout their length,the said gap of said outer member being helical.l

' v MILAN GRUBER.

REFERENCES CITED The following'references are of record in th file ofthis patent:

UNI'I'E STATES PATEN'IS France Nov. 12, 1924

